#include "apue.h"
#include <dirent.h>
int main(int argc,char *argv[])
{
	DIR 			*dp;
	struct dirent	*dirp;
	if(argc!=2)	
		err_quit("usage:ls directory_name");
	if((dp=opendir(argv[1]))==NULL)
		err_sys("cant't open %s",argv[1]);
	while((dirp=readdir(dp))!=NULL)
		printf("%s\n",dirp->d_name);
	closedir(dp);
	exit(0);
}
